3.3 - ELECTRICAL OVERVIEW
Input from-
the user (from the keyboard and the control panel)
is received via the Front Panel boards and keyboard sensors. These
signals go to the
CPU for processing (it has the 68000,
110
circuitry
and keyboard interfaces). The
CPU
passes data to the Channel Group
Processor board, which has the waveform memory. After its
processing, it passes the data to the Channel board which has the 12
DACs (analog and support filters, etc.). After passing through the
audio mixer
on
the Channel board, the signals then go to the Audio
board.
The
"Central Processing Unit" (CPU) board controls the
operation of the entire system.
It reads data from the keyboard and
the Front Panel, directs the dialogue
on
the LEDs and display, tells
the other two boards when
to
generate sounds and coordinates the
signals
on
the various connectors
on
the back panel.
The "Channel Group Processor" (CGP) board acts as
an
intermediary between the CPU and channels. It has,
in
a large
memory, definition for all the sounds the intrument produces.
On
command from the CPU, it will send any sound
in
the memory to a
designated channel (or multiple sounds to multiple channels).
The actual generation of sound is performed by the
"Channel
board". Each of the 12 channels
on
it can create different arbitrary
sounds,
all
of
which get mixed together into two audio outputs.
These outputs are sent to
an
external amplifier and speakers via the
Audio board.
Kurzwell 250 Service Manual, Chapter 3
3 - 7
To Next Page
Loading...
